There are a lot of questions a startup has to answer when making decisions about its cloud infrastructure. Private cloud or public cloud? Amazon Web Services, Google Compute Engine or Rackspace? DynamoDB or open source Cassandra?And after all those questions are finally answered, prudent CTOs might find themselves asking them again as new products hit the market and hourly rates continue to fall.

This is why one investor and adviser told Parse.ly Co-founder and CTO Andrew Montalenti that, when it comes to the cloud, “life is a series of ever-changing alternatives.”

Montalenti, whose startup provides analytics to some of the biggest web publishers around, shared that insight and more about the economics of cloud computing on the Structure Show podcast this week. Here are some highlights of that interview, but you’ll want to listen to the whole thing for more details on what Parse.ly does and which open source technologies…