To each their own, but I don't mind getting my hands dirty for performance. And Yes, I run grease in mine. I do average 100 miles a weekend, so that means I service mine every 5 weeks. Maintenance on the Rhino is good therapy for rainy days.......
Be sure and check front and rear diffs - level - cleanness of fluid. Milky look is water. Diffs are very expensive. I would also recommend servicing primary and secondary clutch sheaves every 500 miles if You ride a lot of dust.