I've said this before every time this conversation comes up. I've never made SNES homebrew, so take that with a grain of salt, but I HAVE made homebrew games for a variety of systems (Atari 2600, NES, GBA, NDS, Dreamcast), so I think I have a little bit of perspective. That said, I think a few things:
1. If this is purely about maximizing profit on a homebrew SNES game, then maybe I'd be worried about audience expectations. Otherwise just make what you want to make. Loads of early NES homebrew games were made, and even sold well, and were significantly worse-looking than what people expected the NES to do. In general, people want something interesting from a homebrew game (and there will always be some detractors that complain about it being too short or too ugly), but the majority of people aren't going to write you off just because the games during the system's prime were better than your games.
2. If it's about art, (I'm speaking out of some bit of ignorance as a non-artist,) I'm not sure it's harder to get good SNES art than good NES art. Looking at RPG maker and opengameart, there's LOADS of SNES style assets out there. Of course, maybe they just "look" SNES style and wouldn't actually work directly. But I refuse to believe that it's THAT hard to get good art for SNES. GBA has similar art style to the SNES, and people were able to find quality artists to work with during the heydey of GBA homebrew. (I speak from experience there)
3. While some aspects of SNES programming are more complicated than NES, I don't think it's about the system being that significantly challenging. NES and 2600 are a pain in the butt to code for also, in different ways. I _DO_ think that Pokun is right -- there's a lack of resources, tools, tutorials, and centralized community.
I've heard from several different people that a big thing preventing people from getting into SNESDev is the expectation that their games live up to the standards of officially licenced SNES games from the 1990s.
Is there really more than just Tepples that thinks this? I've never heard from anyone else that they feel like they're forced to live up to someone else's expectations for homebrew development. And I've never heard that mindset in any other console's homebrew scene, whether earlier or later than the SNES.