They can be collected and it has been done but most likely the shark would be dead before the collector would get it to shore. I Believe the record for a captive mako is less than a week and is held by the NJ state aquarium. I have talked to someone that was there when the mako was and she said its death was from an attack by another shark
You can't put a shark like a mako into a new system. You need something up and running for a year or so to handle a big open water shark. I'd also suggest getting some shark background before spending as much as a car on a fish like that.