why would they resign with Boston for very low pay when they go to Miami, Oklahoma City, Chicago, Dallas, either L.A., etc. If it is truly about winning titles, then they won't come back to Boston.
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because they like the city, the organization, the fans, the coach and their teammates and they want to continue to be the leaders of the team.
Sure, if KG and Ray went to Miami for the vet minimum, they'd probably win a ring but they'd lose their identities and be left with a hollow feeling. If they give it another run in Boston and are successful, they solidify their legendary legacies and get their numbers hoisted (this may happen anyway but another ring would guarantee it).