Fees too expensive

[gilescope]

It's currently using identity fee for xcm:

type Trader = UsingComponents<IdentityFee<Balance>, RococoLocation, AccountId, Balances, ()>;

This is likely to mean the same fees as the relay chain. In all likelyhood parachains don't need as high fees.

https://github.com/paritytech/cumulus/issues/920 - we noticed this on statemint. Encointer have also recently tweaked their code to not use IdentityFee<Balance>. I suspect snowbridge wants to do the same.

[musnit]

Thanks! We're actually busy looking at fee structures for XCM at the moment - @vgeddes will you look into this/incorporate it into our XCM fee plans

[yrong]

@vgeddes @musnit yes, maybe better to use weightToFee instead