DP and gaz, they all have their share of the market. Someone bought it first and someone should be interested again, just make sure you pay the right price, shop a lot before you buy, make yourself a list of price and buy what you like.
I wanted a DP for many reasons, but there are many people that are very satisfied with their gaz MH for their own reasons.
If you buy for resale, just make sure the brand you buy is a reputable solid MH and you will find a buyer when it is time to sell.