cheaper only if the reseller doesn't want to help the OP for a mistake in ordering the wrong ones.
If the OP can do an even exchange then it will be cheaper to get the right carts.
Now it is true that IF Vapornation want to charge the OP fees to do an exchange (which is entirely possible) then yes getting the adapter would be cheaper.
All true enough, but 'ifs'. I understand you like the exchange idea (you did bring it up twice in a very short thread) but also consider the 'best case' (where they take them back for full credit with no restock fees) he still has to pay
shipping back to the return the different version. I bet that's about a push? And he'll have to wait longer to play, many guys don't like that.
And I also think he will follow the usual pattern of not being satisfied and wish to try something different, Omicrons are the 'smart money' tip there I think? How many guys start with Omicrons, 'move on' and never come back? Then consider the number of guys who buy that adapter, put it on whatever 510 battery they have and are quite happy with Omicrons. I suggest you're the only guy I know of that had negative experiences there? Right now I have 6 batteries in use driving carts, only one of them (Persei) and that's because it's got the Bender heater on it.
Difference of opinion, perhaps, based on different experiences? Just suggestions.
OF