I can easily say that, in the current situation, I've been buying more than usual. I had already cut back on buying new product off the shelves due to "price vs. personal value" collecting, but in the past couple weeks I've actually grabbed a few more items off of eBay than I usually do. Four Prime toys (Dark Energon Wheeljack, AM Rumble & Frenzy, and AM Terrorcon Bumblebee), where before that I'd bought one Siege or Studio Series toy every couple months. And I'm looking to pick up more.
So, really, it hasn't gone down at all. If anything, it's just redirected my focus on what I'm willing to spend my money on - after all, if modern pieces I only kinda have interest in are not that far off, price-wise, from older items that I'd actually really like to have, why not just spend the extra scratch on the more sought-after pieces?