Re: Do you think it is safe to buy coins that are only listed on one small exchange?
Well, it all depends on the ambitions and the roadmap of the project. It seems to me that if the first listing of a company takes place on a small exchange, but they point out and work on listing on a large one, this can give good results. Even now, it is not uncommon for a coin / token to fly up tens of percent after listing on a new large exchange. But at the same time, it must be borne in mind that the chances of screwing up are just as high. 
If wanted to buy at early stage then buying few bucks can help then just buy more when it listed in a much better exchange. If it’s a good project it will be listed easily in other exchange to broader their capacity to get users or investor. It’s safer to wait and buy as it get listed in much secure exchange if it’s worthy as buying early in project that shows good potential is an advantage.