I dunno why, part I partially agree with the op about the image of a Rebel body...
Most people have walked into a Best Buy or Ritz and looked at a DSLR casually. Maybe some even did extensive research. Maybe clients have some photographic background.
A rebel, while not a bad camera series just shows a lower tier in product quality. This could manifest into "He has cheap gear, his shots probably suck" or "He probably doesn't do this often enough to make real money and afford good gear"
While this is completely false, on a photographers stand point, perception is everything.
It's like putting a fully worked 2nd gen Rx7 with a stock body next to a porche boxster. The avg Joe schmoe will assume the porche will win everytime based on "perception of cost"
Or even better, you could pair an underpowered car with an experiences driver (i.e. The gwc) and he has a much better chance to succeed
I'm not going to lie. When I do shoots on location with clients, 75% of the time I'll shoot with a flash bracket I don't need because a client needs to feel they are working with a "pro" for them to feel comfortable (not always but for the most part)
I get always get a comment like "wow that's some serious gear" with a gripped 50D 430ex II and a 70-200F4
While it's not top tier equip, the bracket makes is presentable.