This might be common knowledge but would like to know if anyone does this is practice.

I have about 1.0M miles and travel to Europe quite often. Would it make sense for me to book out as many mileage tix as possible for the next 330 days (best estimating dates as I can), and just hold the tix to redeposit later if I don't go?

I'll be able to find pretty good deals far out, my only downside is really floating the fees and taxes. But with "dynamic" pricing occurring, I think holding tickets may be of greater value than holding skymiles. Basically ticket down my account to zero. Thoughts?