i would imagine as competition hots up then the data allowances will soon increase
there is always a premium to pay for being an early adopter and the 4G network is very limited at present, they obviously want to set it up as a premium service at the moment... it has the benefit to the provider that the bandwidth won't be hammered as soon as it is available with too many people using the available cells
as soon as one provider starts undercutting another they will soon come down to much of a muchness
keep calm, carry on