Do stands make a difference for equipment?

You have a very good system, well past the point where a good equipment stand would make an positive audible difference. I use the Adona Zero SR4 and love it. To me, it had the effect of making the speakers dissapear more as sound sources, which probably has to do with the added stability lowering noise maybe. Who cares why; it looks great, has great access, and is super stable. I too used a Target T5 for about 15 years. No comparison. Core designs makes well engineered racks that are very attractive as well, but use a good bit of wood if that's your preference. We all know some of these brands can reach very high prices, but these two brands are within reason. Another good thing about the Adona is the great and easy adjustability of the shelves.
Reading what Rockadanny said above reminds me about Starsound. If it within your budget, I'm sure ut is better than what I have. I have the SP-101 supports beneath my speakers, but if I could afford the equipment rack I would buy one. They are the real thing.

Elizabeth,
I frequently agree with your no nonsense, common sense views on sound systems. If I were you, and had not experienced the difference that Sistrum stands could make under my speakers, I too would consider them a wasteful purchase. I recently spent $60.00 on EVS ground enhancers, and while they did add to soundstage coherency a little in my system, I probably would not spend the money again for the small difference I perceive. The $20.00 AMR fuse is a different story. A substantial improvement in midrange clarity for very little money. Would I spend 60 or 100 dollars on a different fuse if I knew for a fact that it was a little better sounding? No.
My point is that sadly, it is nearly impossible to know what is or is not going to be "worth the investment " in your system until you try it. It is always a gamble.
Where I disagree with you in this case is believing that spending more than a given amount on such things is foolish. I don't see why it would matter by what means improvement is made, as long as it is genuine. In the case of the Starsound speaker supports, there is a shocking level of improvement. Of course, in your case, you use Maggies, so I don't think it is possible for you even if you cared to do it.

Syntax,
Having tried Sorbothane padding vs. small pieces of blu-tac, I must disagree. You may prefer the Sorbothane to other interfaces between speaker and stand, but I didn't, and they certainly sound different.

Mapman,
Love your posts, but this time I must respectfully disagree with one of your statements. I do not believe that stands, racks or platforms are always meant to "tweak the system for a particular sound".
Using Starsound as an example, because I use a couple of their products, the idea is to drain vibrations, and lead them away to ground. What you hear when that is done should be the actual sound of the supported component less the vibrations and the noise they cause. I wouldn't consider that tweaking the sound, but rather revealing it.
Your point about the importance of room acoustics is certainly true, but people who have not experimented with effective vibration draining devices are truly missing out on a cost effective (depending on the brand) sonic improvement.

Just noticed that way back near the beginning of this thread, Elizabeth, who is normally sensible and well informed offered the opinion that high quality racks make nearly no difference. That is definitely not so Elizabeth. It is as important for amps and digital components as it is for turntables. If you disagree, it is because it has not been demonstrated to you in your own system.
I recently started using a Starsound Apprentice rack beneath my transport on an Adona rack already, and the difference is easily noticeable.