[pm]

Seeing as I can't reply to the comment in question... the price hike article you mention is in 2011. The price hike was a change of system, and everything went up because most people were using Python 2.5 which had no threading support. Python 2.7 had proper threading support, and unsurprisingly when that was enabled, everyone's cost dropped by three-quarters. Google dropped support for 2.5 two years ago.

If were really worried about costs, you'd convert your App Engine app to Go.