"Understand that producing all that activity takes a heck of a lot of increased work and effort."
Although you say you're not complaining, by putting this in writing, you just did!!
Frankly, I don't blame you!!
Your clients need to decide what side they operate on business wise. If they don't want to hire - fine. We've seen this for some times now. But they shouldn't say they are for their PR. However, If they do put our a req, this is their commitment. You did your job, they need to compensate you for it. Your relationship with your clients does need to be evaluated based on current trends.
After been burnt once my contracts were modified so that if my client hire me to build something for him he can't stall when it comes to deployment and comes up for whatever reason (because once deployed he needs to pay the bulk of the contract) not to move forward, he WILL be billed for the balance BY CONTRACT because the work he commissioned me to build for him was built, per his reqs.
The news over the weekend was that companies want to hire, but can't find the right candidates. Employer demands mean some jobs go unfilled (http://www.msnbc.msn.com/id/39604781/ns/business-careers). This is what happens when employers throw in everything but the kitchen sink into the job req. e.q merge 3 full time functions into one, demand a Phd. at minimum, to run errands for the CEO and still think that they can pay minimum wage for it.