ok, I am confused now. Do you want to be exclusive to DT? If so, please shift your eyes to the right part of your monitor and notice that DT is a Middle Tier company not a top Tier thus why would you want to be exclusive to them? Just upload 50 images to them but don't mark the box exclusive or agree to being exclusive if you don't want to be- still confused now?
Ok, now I'm really confused, because anybody who uses the chart on the right to base their business decisions is making their first huge mistake.
Going exclusive at DT is fine if that's what you choose to do.
I'm exclusive, I have a 90% + approval rating and I rank pretty high up on the pages I don't have a huge portfolio but my 700 images make me about $700 a month
I upload to one site, almost everything I send is approved and I'm treated like gold.
To answer the OP's question, they just want you to have 50 pics uploaded once you request exclusivity they will convert all your images to exclusive content
And, Spray and Pray, for the longest time I've left these sort of remarks alone, not ever bothered to comment on them, but your ignorance put me over the top.