To check on the value of your friends pricing for his Maui and Ocean Pointe units you should review the for sale listings for both units here on Redweek and on eBay. On eBay check ithe buy-it-now listings and completed listings. I think his pricing may seem fair to him if he purchased direct from Marriott, but they appear higher than I've seen on the resale side. I'd say you can get the Maui unit for under $5000 and the Ocean Pointe for $3500 (roughly half his asking price).
As for the trading value, both units will trade well on Interval International (where Marriotts trade). Almost all Marriott's also trade well for any other resort group. Between the two Maui has higher demand, but Ocean Pointe is a 2bd unit so between the two it may be a tie. Owning Maui is best if you want to go to Maui. If you are going to trade you will want high demand/trade value units with low mainentance fees. Good Luck!
Erman C.