The Art of conveying skills.
From O3.4, p. 33
Financial support is rarely possible for an incubator, although it would be almost certain to attract higher quality companies and help them develop faster. Some incubators, and especially accelerators, regularly raise a fund to be able to invest in companies. Financial support can happen in the form of investment, when the incubator would either receive shares of the company or make a profit-sharing deal, or as a grant. Other ways to support companies financially are to collaborate with private or public funding organisations, and to educate teams about funding options.
Alumni events, as alumni often are re-investing through seed investments.