I think must be that shop whose owner needs a new car because his Cibic Tipu R rosak d.

What type of maintenance do you have to do? I know in normal household vented dryer, users need to clean the filter or else overheating can happen.

Commercial lpg price is much higher than domestic punya. If totally pass the cost to customers, may drive customers away.
Only non business people think businesses like to pass all costs to customers, and increase prices sesuka hati.