IMHO, recapping/referbing "vintage" gear is worth it.
If you are unsure, just pull and test a few of the caps, see how good/bad they are. From my experience, lower voltage caps go first, they usually start to drift up, ESR goes up. When you replace these, you will get bigger soundstage, more clarity, wider dynamics, just more of everything.
Finished my pre and power amp refresh a couple weeks ago, got all audio grade caps, diodes, metal film resistors, and new fuses. Total cost was under $150, took me about 12 hours total for both pieces. should be good for another 20 years.
For shops doing it, look in the $500-1000 range for a full refresh per unit. But they will sound better than new. New caps are superior to old ones.