I think I understand economy of scale, but this is ridicules
Seems to me Garmin has lost potential sales in the X76 market segment by ignoring it for so long.
I believe many if not most 276c (now 5yrs old?) owners would have already upgraded at least once and some twice if there had been new generation units with the functionality they desire. I suspect some may have been forced to replaced older units that have died with the same thing as nothing newer was available.
I know many in the handheld segment have upgraded several times. Not the same price point I know, but I my self have owned 3-4 different Garmin handhelds during the run of the 276 form factor.