Although i believe in spreading the love I think its important that you dont dilute its value and impact.

500 sp in the hands of one dedicated person can create more network value than 1sp delegated to 500.

Personally if it was me I wouldn't delagate to more than two people with a 250sp split.

At 250sp this still represents serious value and is likley to generate real legitimate excitement for the receivers while also weighty enough to cause a sense of duty to do something important with it.

I would also definitely have a minimum personal sp requirement from the receivers as proof they have or are developing an understanding of the system.

An additional max sp cap would also be useful eg if the delegation represents less than a 25% growth in total sp the delegation may be taken for granted.