Big company or small?

I recently received this from a reader:

I've just been told by a long-time (12 year) client that using a large company rather than my small one can help with contract concessions. For instance, their new, acting CEO (a CMP herself) thinks a large meeting planning company can, through their "purchasing power" do away with a performance clause and/or do away with any attrition penalties they are assessed due to poor attendance. She's "hot" with this issue since they were assessed attrition penalties after their June, 2008 meeting---although I did negotiate 25% slippage. What's up? Have I missed something here?

Any suggestions/advice for this person?