I'm not sure that you can compare FI (H) rates with FI (A). It's certainly not that one FI is better than the other. It might be more to do with the fact that to become an FI(H) most will have spent around £45-60k (having to pay extra for the conversation to each machine they want to fly). Perhaps historically, helicopter schools have realised this and priced their rates accordingly. Of course, it could also be that FI(H)'s have all informally agreed not to undersell their services once they get there and thus hold the bargaining aces. So you could say that there is an informal 'union' of sorts I suppose.
I chose the helicopter instructor route maybe because I saw a better return on the investment (nothing to do with the fact that after rotary flying, fixed wing is just pants.... sorry, sorry uncalled for
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Interesting about the £30-£60per hour bit. I only know of £35 for FI(R) and £40 for FI. I'd best get out and check my contacts.
Balance!