One thing people never count on is all the stuff your taxes pay for, that you end up paying for in other ways. Things like trash collection, sewer, water, library services, snow plows, etc. You move away and either you pay yourself or you do without.
Jam is mashed, preserves have chunks of fruit. With some fruits it’s hard to leave large china during processing (like raspberries, which break easily when properly ripe), at which point raspberry preserves might have less sugar then raspberry jam.