With 5000 hours jet and 1500 P1 in the 737, it makes sense to spend your hard-earned on a LHS course, if it is the A320 you are after. Chances are you would get a direct entry command offer somewhere with that time.
But for someone with no jet time, imho you need to go for RHS training. Doing it LHS may stroke your ego, but will make life all that much more difficult if you land an F/O job somewhere and are expected to perform well from day one in that seat. If someone with no jet time thinks they can hack direct entry LHS with a new operator they may need to rethink. It can be done, but is unusual unless upgrading through the ranks with an established operator where the upgrading pilot is already familiar with SOP's local route structure, company culture etc.