I'm a BST since level 1 and well before the new dynamis.
I also do a lot of dynamis solo and with the linkshell and friends.

As far as fighting muiltipile mobs, there link like mad, so yes I can be expected to fight more than one at a time offten.
Also TH as very little effect in dynamis on coins.
Its the staggering that gives up to 3 coins, while TH gives that extra one, which is still low.
If I go in with a thf pet, TH is the lest important reason for having it out.
The main reason is high evasion and triple attack.

I like others hate it when you get a small group of ppl pulling all the mob of the same type, rather than going on a few at a time, making it harder for me to farm.

But that's how it is, were ever there is tons of gil to be made easy, there will always be a large group of ppl cashing in on it.