I think exchange rate alone is a misleading number and can lead to you promoting scams. Instead you want to list % of genesis block allocated to PTS.
According to the list, this is a bad deal (but it is actually a very good deal):
1000PTS converts to 1 coin, but PTS makes up 100% of the genesis block
And according to the list, this is a good deal (but is actually a very bad deal):
I'll make a coin that gives 1,000,000 coins per 1 PTS. But PTS will only take up 0.1% of the genesis block, the rest goes to me.