Word of warning to users looking to increase multipliers

For what it's worth...I just built my multiplier up by 16.5% with 6 boardwalk fountains from the vault. Stored my 10 SH Deluxe Condos and 2 Private Islands, or 12%. I'll keep at this until all SH monstrosities are gone. I hate them, but do enjoy the hidden XP. and don't want to dump them all at once. A bit greedy here....Still, one day they will all be gone!