I'd imagine 1974 AD not doing a concert for a mediocre some, unlike many Nepali artists and that could be the reason why their price had to be set high (GT bro probably knows all about this though, I'm only guesstimating). 

Re: Venue, maybe it's not easy/cheap to rent big halls in Texas as opposed to other states? I know for sure that it's almost unimaginable to rent big halls for concerts in states like CA because you won't be able to collect the cost incurred to rent those places alone!