Quick analogy;
It's like canning your own food vs. buying it in the store. While canning can be cheaper {if you grow your own already/have the supplies} it's much less time consuming & convenient to buy pre-canned.
Or, the time/energy involved in creating a meal; shopping for the ingredients, then putting them all together vs. going out to eat which is also much less time consuming & convenient.
People don't think twice about these trade-offs of paying a higher premium because their time is much more important than their money and/or it is a more efficient use of both.
But I guess as sweepers, we have the "free lunch" syndrome, and get annoyed when anything is required from us in return for the shot at free prizes - I hear a lot of complaints when a sponsor asks for anything more than basic info to fulfill.
I keep in mind that when a sponsor chooses to use their advertising money on a promotion {sweepstakes, contest, etc.} that they are looking for new customers and/or trying to keep the ones they have, so anything they ask of me past that info, like sharing, referrals, subscribe to their newsletter, etc. is the "price" for that "free lunch" and I decide my comfort level.
So for SA vs. SP - SP is an inexpensive convenience that allows me to customize my sweeps the way *I* think they should be - priceless, IMHO!
So any sweeps that awards prizes *during* the promo instead of at the end {or draw at the end from daily entries for specific prizes on specific entry dates} are IW's, so I create my own categories & put them in;
DP/WP/MP {Daily Prize/Weekly Prize/Monthly Prize} And I treat them like they are IW's, since most of them award prizes daily!
If this matters to your friend{s}, let them know that the majority of DP/WP/MP types are run thru FB/Twitter, and only PLUS members can even save FB/Twitter sweeps!