Anybody have a problem buying modded units.

I'd agree that modded units appeal to a much smaller group of buyers than stock equipment, and are therefore somewhat harder to re-sell. I can think of 4 factors that are relevant:

First, the mod invalidates the manufacturer's warranty (although the firm doing the mod may offer a warranty).

Second, all mods reflect, to a greater or lesser extent, the audio quality deemed "desirable" by the person doing the mod. This makes the mod a much more subjective process than sticking with a stock unit that sounds the same for the entire model line.

Third, some mods simply sound different, and not necessarily better, than the original unit.

Last is the question of whether the incremental improvement gained from a mod is worth the cost (which can often be quite high), or whether it simply makes sense to spend more money initially and get a much better piece of gear that is manufactured in large enough quantities to benefit from the cost savings of production runs.

To Jayctoy:

You are correct - I don't own any modded units, although I have in the past. My decision not to go this route is based on personal experience with having a number of mods done to my equipment (CD player; preamp; and amp) during the 1980's and early 1990's.

Having audio gear modified is an entirely legitimate road to changing (and hopefully improving) the sound of your equipment, but in retrospect I never heard a mod that sounded better than the collective cost of the equipment plus the cost of the mod. Hence, my comment that I think the better route for MOST audiophiles is to simply buy a better piece of equipment to start with. After 40+ years in the audio hobby, there's not much I haven't heard -- but I still remain open to new technology and new ideas.