Stat bonuses: owning a land gives 1% speed, extra 10 minutes in sauna, 5% less energy consumed for actions, etc. owning multiple lands increases these amounts. can make it more interesting by giving additional bonuses for players that own one of each land type, perfect lands, empty lands and so on.
Unique name tags: Name color, text size or icons in game and chat unlocked for total cumulative days held. 1 day, 100 days, 1000 days, diamond hands.
Quick planting/harvesting/watering on lands you own: click to plant all seeds, water all plots, harvest all plots, or collect all ready items on lands you own
Daily login bonus: receive login bonus times number of lands owned