AdStage is an all-in-one reporting and automation tool designed for cross-channel paid advertising accounts. It allows users to manage ad campaigns from such networks as Facebook Ads, Google AdWords, LinkedIn Ads, Twitter Ads, Instagram Ads, and Yahoo Gemini. Plenty of AdStage users are happy with the platform, but it isn’t for everyone. For starters, AdStage plans are based on total monthly ad spend. The cheapest one starts at $1,048/month for up to $50k in ad spend. Many agencies could quickly…