a brand new bike should be serviced at the franchise dealer for the first couple of years, they will fix any known problems, sometimes without the owner being aware of it. After that DIY is OK, although it depends on the bike.
some bikes are sold with a FSH Full Service History but my Yamaha XT600 had no service history at all and it is fine. You will probably save more money on service costs than you will reduce the value on resale.