I haven't seen the survey idea, but if they pay and it works, then go for it! I conduct fundraisers for several of our local rescue groups, but to be honest they are most successful if they can be combined with home parties or personal shops, because items sell better when people can see them (home parties for pet owners is my fun job...and some day will be my full-time gig).
Shopping portals can work online if marketed correctly. Other than that, most of my ideas are "in person" type things. I'll keep thinking!