i've spend almost $700 with dynadot. They're great. a very simple, easy to use website. Unlike godaddy, they don't bombard you with ads and sales when trying to do a simple checkout. They keep it plain, simple, have great uptime, and make transfering domains from one account to the other a breeze. Best of all, they accept paypal and moneybookers Hope this helps
Yes dynadot offers parking and parking revenue. If you purchase a domain and do not change the namerservers it will automatically be parked. You can see what their parking page looks like Here. Also, at the end of every month they will credit the amount to your dynadot account so you can use that money to purchase even more domains. Hope this helps