Whose receiving DGPS signals and what kit are you using?
IALA and Inmarast or can you get VHF signals where you are?
DGPS were do you get it from and with what?
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I don't think many recreational boats are using DGPS, mainly because regular GPS, especially with WAAS corrections, is good enough. One unit I do see sometimes on yachts is the Furuno GP37 GPS/DGPS.
DGPS predates SBAS (WAAS/EGNOS/MSAS) and requires a separate antenna & receiver, whilst SBAS (WAAS/EGNOS/MSAS) can use the same antenna as the GPS itself. DGPS only works in the vicinity of a DGPS ground station, WAAS has US coverage whilst EGNOS covers Europe and MSAS covers Japan.
I'd say its clear from the above why most new recreational GPS receivers use SBAS.
http://en.wikipedia.org/wiki/GNSS_Augmentation#Satellite_Based_Augmentation_System
http://en.wikipedia.org/wiki/Differential_GPS