I would caution that if you have a small amount of travel funds (i.e. less than $100), then it may not make the most sense to convert to RR points unless you already have a decent amount of RR points in your bank.
In my case, I can convert to RR points and would receive roughly 6,000 points for my $75 travel funds. But the flights I'm interested in booking in the future run roughly 14,000 points. Because I only have a couple hundred RR points in my bank currently, I would need to purchase additional RR points in order to use my converted points on the flight I want. To purchase enough additional points, I'd have to pay $220. If I keep my travel funds and deduct that from the flight price ($242), then I'd only be paying $167. I do understand that RR points don't expire, but it would take me at least another 2-3 times flying to cover a future flight purchase.