I can Shine some light on this for everyone :)
The most recent Example is NME. Dan clerkie started Enemy esports with a investment of 50,000 (He did pick up a few other investors over the 8 months) and in 8 months had them in the LCS and was offered 1,200,000 million dollars for his team. He then laughed and politely turned it down.
https://www.reddit.com/r/leagueoflegends/comments/34vmhk/enemy_esports_decline_12mil_offer_to_sell_team/
http://esportsgo.com/enemy-esports-turned-1-2-million-league-legends-team/esports/
Thats the most recent example.
As For "what it takes to Make a Semi-pro team?"
This inst the right line of thinking really.
You are creating a brand when you undertake something like this. The team or teams will then fall under your brand. There is a plethora of cost and expenses associated with brand development and marketing. Which is another topic.
But as far as
costs associated with a Semi-pro team:
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Relatively low as players live in their own houses and compete virtually.
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Some form of sponsorship and pay is industry standard as well as paying for all travel expenses when they go to events.
So over all its cheap to start a team/brand but the more capital you put into something the better off you will be.
Feel free to ask questions.
Hope this helps,
You So Bad