Well it depends on the project itself, if they think that their coins is not worth to be listed on top exchanges then we can't do anything about it.

I'm not familiar with this coins though, but if the project just started then it make sense to be listed on couple exchange first before going full blown on the next couple of months.

But if the coins has been in the market for the last 6 months, then there's something wrong with it. Its either the devs has abandoned if, or not really interested to list in on top exchanges or just maybe for pure pump-and-dump scheme.