There's "not budget friendly", and there's "The purchase cost of one of those private super yachts in maintenance every 5 years."
I'm not exaggerating. You can buy a new 154ft super yacht, rigged, with engines for about 13 mil. One of the places that builds them is near me in Tampa. The US Army's crappy 174ft Landing Craft costs us right at 4 mil every 3 years in scheduled shipyard maintenance. That's not counting any extra dents we may have put in it. It would not shock me at all to learn that a 688i had 50-75mil in scheduled cyclic maintenance every 3-5 years.
That removable dry dock RKL mentioned? Probably twice a super yacht's price just to buy that one little pod. And a complete refit after every mission.
The DOD spends stupid ridiculous money on maintenance and upkeep of our toys. But that's why they work well, and tend to be pretty close to the bleeding edge.