Muddy's correct that it is NEVER used directly for patients. The blood centers (ARC and local/regional centers) are entirely volunteer, and they do have pretty strong restrictions on what they can "do" for Donors (other than providing juice and cookies when you donate)--it is acceptable to give out coupons to donors for things from local merchants (I recally a free Big Mac coupon once), but not to pay them.
The Plasma centers do strip the plasma component (the "clear stuff" in the blood), and ship it to manufacturers who will extract and purify the Albumin and Plasma Protein portions, and re-sell, along with use for manufacturing (not shampoo, though)--your plasma goes into a huge vat of other plasma to be used, and is basically not tracked.
Most clotting factors are recombinant human factors now--the Factor 8, 9, etc. that hemophiliacs get are from human genes inserted into bacteria or other cell lines, and the produced Factors are purified for injection.
Most of the factors used by the Doctors in the hospital (unless the patient is a diagnosed hemophiliac) come in the form of Fresh Frozen Plasma--when you donate, the "unit" of blood is about 500cc's (about a Pint)--it is spun down into the Red Cells, Plasma and Platelets, and each is removed and bagged separately. The Red Cells get an additive that gives them about a 40 day shelf life, the Plasma is frozen and is good for a year, and the platelets are good for 5 days (agitated at room temp). This is when you donate at a REAL blood donor center, not a pay-for-plasma place. Each unit of blood you give there is very carefully tracked and the records are stored for over 10 years.
When you get in trouble, and the Doctor orders blood for you, he usually gets the Red Blood Cells--they provide the oxygen carrying capacity to your body. After that, he may decide you need help clotting, so he will order Fresh Frozen plasma to be thawed (then it is good for 24 hours) and will infuse it to help you clot. Platelets are also involved in the clotting process, and may be given if you have a severe bleed.
Muddy is right--if you really don't need the money, the Local Blood Centers or American Red Cross are very professional and clean, and the donation you make will save someone's life--There is always a need for blood of every type (not just the type that they announce on the news on occasion--"there is an urgent need for type O - and O +"), and it gets VERY bad around the holidays.
AFARR--BB(ASCP)
Muddy--I did the BB thing for 8 1/2 years at night in a Level 1 Trauma center before I "quit" to go back to school (I still do it part time)--are you talking about going back to school yet? I have NEVER met a MT that didn't talk about it through most of their career.