The SPS currently has over 2400 SBD (US$ 1880) to distribute per day

True. However the refill rate is only about 1600 per day so spending above 1600/day depletes the fund. It could be done on a one time or short term basis, but it wouldn't be sustainable.

However:

1. Your proposal to spend 800 per day fits within the refill budget
2. Rewards from posts can also be used. Some of the existing proposal recipients have used a hybrid model of getting some funding from SPS and some from posts.
3. Beneficiary rewards from posts can be used to refill the SPS faster.

On the matter of funds not being guaranteed (which would therefore make it difficult or not impossible to sign a services contract), this is one reason to want to fill the SPS fund to a higher balance rather than deplete it. Doing so allows faster payouts of the entire contract amount, so approval becomes more of a binary decision (which allows for signing a contract or not) rather than a slow stream of funds which could be cut off in month or two for various reasons.