When converting inside a set of six, it takes an average of 15.113313227 converters if you're targeting a specific enhancement. This is based on me tracking 2321 enhancements I converted. I used 35,124. I spent over 2.8 billion purchasing those converters on the market, so that is influence that went to other people.
Also, your idea isn't going to happen. What you're seeing from converters and it's impact on the market is the intended goal.
Now if you want to know what actually harms the common person, I say it's the last 5 display bug. Converting in set attempting to get Miracle +Recovery when the last 5 was displaying correctly made me an average profit of 1.614 million influence per enhancement for 581 enhancements. When the last 5 bug was active I made an average profit of 5.134 million for 259 enhancements. And I posted each one of them for the exact same price, but people didn't know better so they just overbid because of the last 5 displaying incorrectly.