Does anybody know where the CARs say that some types of training ops require them? I don't think they do...
In which case, if you don't want one, you simply say "No thanks", and smile politely.
On the flipside, perhaps he's offering you a bargain. Did you even get pricing info from him?
He has no conflict of interest. He can't make you get one if there's no regulatory requirement, and he doesn't write the regs. Perhaps he shouldn't be pedaling his wares on CASA's time, but that's a gripe for another post.