Put simply, I have been spending a lot less these last few months (restaurants, travel, etc.) and that has freed up some funds for purchases. That said, I take a long view of prices and value. Having started collecting in the 1980s, some of my 'expensive' purchases then are worth a lot more now; not that I have any intention of selling.
The other problem is that I don't have too many gaps left so, when desirable coins become available, I'm more inclined to 'splash the cash'. The same is true of key upgrades. Looking to expand my collection into a couple of other areas and have my eye on a type set and plan to 'raid' an auction or two for that one.