1.How to get alot of MP
-Save all retired items and sell them later.
-Buy marapops or drinks in cans,empty them and sell them to make more MP.Recycle them to buy items from the recycling center and sell them.
-Sell items that you no longer need.

2.How to get alot of BP
-Find a enemy with very weak attack power and keep on battling him until he is stronger but rewards more BP.

3.How to get people to buy your items quicker.
-Add alot of 9s to your prices for example
Price 500,000MP,but put it 499,999MP to make it look cheaper.