I feel it depends on the reason you're doing it for. If you're submitting your art to a number of groups because you're an attention whore... then that's a bad reason, haha. I don't mind 10+ groups if it's for exposure. Personally, I think exposure is a good thing. ;A; There's one thing I want to achieve in my life: to be able to impact others' artwork and ultimately their lives would be like a dream come true to me. QwQ -brick'd for being lame-
And I feel bad if I reject invitations for my artwork, hahaha.
I think if people invite you to add their art to a group then it doesn't matter how many you enter a piece into. After all, it's not you being desperate to enter them, but rather the people wanting the piece in their group's gallery.
I used to submit to like 3 o 4 and thought it was too much!! but then the drawback came when I got like 1000 new artwork from the groups I was in and got fed up (and kind of guilty because I almost never checked them) so I just quit the groups that posted like 100 thingies a week and stayed in just 4 that I think are good, but I don't submit anything anymore 8(
I hate it when some people think they can choose for others ex. "what's too much" everyone can do what ever they want and it's true that popular artists don't need so many groups to get feedback, but many others do "':/ But if I have to say I think +30 is quite a lot...
I usually submit to around 10 groups to get people to see my art. But then there are alway's lots of groups who want to submit my art and I rarely say no so, but I don't think any of my pieces goes ober 20-25 ...
I think if you are an artist that usually go unnoticed and really want people to notice their art it's fine to post in more than 10 groups. But maybe if you usually get over 2000 favs and 200 comments outside groups, you maybe just want to post in 2-3 groups