While I'm pansexual and in a gay relationship with a trans male, I can't really vouch for what would help us as a gay couple, but in the past I have been in gay relationships that this applies to, so I do at least have a few opinions on what would be nicer.
What sits at the very top of the list is stronger and more powerful anal/prostate vibrators. A big issue with past relationships has been the fact that there's been a real struggle to find prostate play toys that actually get the job done.
Another issue is it's not especially easy to convince somebody to start using toys in the bedroom because there just aren't that many toys that are great for introducting somebody to using toys. A lot of the less intimidating stuff is usually cheaper, but often doesn't really give much of a lasting impression, if you get me? It'd be nicer if there was more premium, high quality toys that dont seem rather intimidating to use (for example, a lot of male vibrators in the premium end, even on the minimum setting, can be rather uncomfortable for a beginner, it'd be nice if there was toys with a much better range of speeds and settings etc, most just use 3 to 7 that dont really help much?)
One more thing I found was that there's a lot of small adjustments made to toys that were really useful. For example, cutting the top off a lovehoney basics stroker to make it open ended so it could be used on two people at once. This was great, but it'd be nicer if there was perhaps longer ones that could be used for this (i now have a mental image stuck in my head of a chinese finger trap but with todgers...)
More attachments for magic wands that men can use would also be nice. So far LH only has one anal attachment in a prostate massager. It'd be nice to have something more substantial to be used like a dildo or just any sort of length that's longer than the small prostate massager. That said, more attachments in general would be nice. The hummingbird is incredibly hit and miss depending on a partners size. I found that I could only ever use it on myself and not my ex because it would just hurt him, so there was basically zero use of my wand on him.
More penis vibrators in general would be useful. There's a very minimal amount of them. Some BDSM play is quite limited just because there's simply not enough mens toys you can really use. One person I have been with had told me that during a session he felt rather bored with toys and would have preferred just me. All female friends have said they prefer toys being used during such sessions. It seems that perhaps the options available for men just aren't as good as for females.
'Sensation' lubes like menthol cooling ones or heating ones are lovely, because I've had a problem with a lot of guys where it can be rather dull just having some vanilla sex, and it's really nice to have extra options.
Anything to make oral a little more excited is appreciated.
But that's just for couples. As far as solo play goes, my one gripe is that even with bases, a lot of anal toys still come out once in use. I have a wonderful prostate massager that I have to keep one hand on at all times or else it comes out. Really defeats the purpose of a hands free orgasm, I think.
While not for me, but for others, more butt shaped fleshlights would be useful. Most of them are vaginal and most gay guys don't really want to be using that.
More discreet dildos would be lovely. Part of the reason I don't buy many is because they're quite blatant compared to most other things.
Stronger strokers and masturbators. A lot of them seem to rip or get damaged with even the most remotely rigorous use. Only the big expensive ones like tenga flipholes seem to get long mileage out of them.
Phew, that was a lot. Not sure how much of that is feasible.