I "suspect" the ones that are making a profit might not be in a hurry to give away a percentage of the profits to a financial investor.
If there was something in addition to a cash investment that they though would help grow the company significantly, then maybe.
The only thing I can think of (and I do not have any stake in the companies) is maybe a situation like the hard limit being owned by tickle abuse being for sale. There are other people and companies that would like access to some of the equipment built by the owner. Depending on the selling price of the company and what equipment comes with it maybe you could purchase this company and have it run by another company. A couple of years ago the tickleroom might have been a great option. He seemed to have access to a good number of fresh faces participating in tickling that were not models appearing and a dozen other sites. He did a great job making videos with only a chair or 2 and some poorly tied rope. I imagine if he had some more elaborate equipment his company could be huge. However, that was a couple of years ago. The percentage of fresh faces has diminished and the number of veteran models has increased. With that in mind good luck..