Apparently you get a discount on the execution time for provisioned lambdas, not sure how much this would offset (the more actual utilization you get the better I guess)

@ben11kehoe @kondro @mwarkentin You pay for the configured Provisioned Concurrency with a flat hourly charge. Lambda usage gets billed the same, but with a discount on unit pricing ($0.035/GB-hour vs $0.06 on "on demand").

http://twitter.com/ajaynairthinks/status/1202125357144391680