Expensive to travel relative to what? A developer salary is probably at least 90k, so that's a 1% cost to get someone on site for a few days, all expenses paid.

Expensive to travel relative to what? A developer salary is probably at least 90k, so that's a 1% cost to get someone on site for a few days, all expenses paid. Now look at the big companies, devs make 4x that and don't require any extra accomodations for travel.