Affordability. Buy just one rifle (and scope) and apply the thousands of dollars you save toward ammunition, licenses, tags, and travel. You'll hunt more often and be a better shot when you go!
The serious hunter with just one rifle probably "knows how to use it." With just one rifle you do not need to remember multiple safety positions, trigger pull weights, trajectory curves, and wind deflections. Consistency may be the hobgoblin of small minds, but it's the foundation of superior shooting, too. Sticking with one rifle helps you to be a faster, safer, more confident, and more precise shooter.