Absolutly. Buyer be ware and all that.
It's amazing how gullable people can be. I think the worst example is what European Flyers used to do with that Eusoshare scheme, where they where sold a share for reduced rent - only thing was you did not own any hardware, so when it went belly up, you had nothing to show for it.
That's not to say that there are not some good deals around if you pay up front, most of which (note the word MOST) are reputable. The sharks are by far in the minority, but it's up to you to work out who they are because they sure as hell are not going to tell you.
Reality check time. Do your homework and evaluate if it's for you or not.
PS