Depends to a large degree where you fish for them, and of coarse the type day you do it regardless of boat size.
In the late 80s I went to Kona Hawaii and fished for Marlin.
Kona is on the lee side of the island, and as a result the water is usually very calm. Not only that, but since the islands are volcanic the water is very deep very close to shore. So that puts you in Marlin type water as soon as you exit the marina. I caught a stripped Marlin and had a blue on for 2 jumps before he came off the hook, both within a couple miles of shore. I also have pictures of a young native of about 20 with a large blue on his boat of no more than 18' at the dock.
He was all alone when he caught it and thought no more about that than most of us do catching a decent Bass.
Of coarse in Kona, at least at that time, all fish are/were the property of the boat and were sold for meat.