True, it can be costly, I agree with it. But there is no other way to have fair elections where everyone beleives that the election which happened was fair itself.

In paper ballot voting, the election commision is gonna count the paper ballots one by one. It is gonna cost money. The same amount of money will be for EVM+VVPAT. (less actually, as paper counting will be less and reserved for candidates who want a recount).