Buying synthesizers can be a decent way to invest/save. If I want to save $250. Instead of throwing it in the bank. Buy a synthesizer for a steal of a price. I bought a waldorf blofeld module for $150. Casio CZ 3000 for $100 2 years ago. Didn't "need" them, nor was I looking for them. Instead of letting $250 lose money in the bank, I bought items that were guaranteed to sell at a profit while enjoying them. Even if I never really use them much, it's better than the bank.