The problem getting into the market is the fact it is small. In comparison or any other way, it is small numbers with high competition.
Of all this type of flying I think it is more who you know. As crews will often fly together with not a lot of rotation - the crew will have a larger say than normal>
Years ago in Africa many a pilot got an endorsement on a Citation to be a "required" co-pilot and who ever could fit into the required flight dates and times jumped in the R/H seat. They got the endorsement if they were on the in crowd in that city.