In actuality, Henry VII was a usurper. He was keenly aware that for a King to hold on to power he needed to be the richest man in the Kingdom. He ruthlessly pursued every avenue be that man and stay on top.
There's an interesting tidbit in the related vid up there -- he had the Commons approve his accession, but it contained the date, a day before the Battle of Bosworth, meaning that anyone who'd fought on Richard III's side had committed treason.
Britains Real Monarch with Tony Robinson
Mark