be careful choosing the b option
why would you spend $1,000 on a traffic domain only to receive $1,200 after 1 year. $200 after a year is almost worthless. such a small gain. unless you had thousands of such domains, in which case it might be worthwhile. for 1 domain and a $200 bonus , waste of time.
and more importantly, any domain earning $100 a month from a parked page would likely have some trademark/typo . If it was a real generic name, with traffic. it would never sell for $1,000. try adding another 0 to the end.
for any tm,typo, misspelling, or company name, you should not pay more than a few months revenue. more than 6 months and your crazy. what if you get a dispute letter after 3 weeks ? $900 lost
and your also assuming, you will receive $100 each month. usually things can only go down. the person who owned this name before you likely knows how to maximise the gains, and traffic. only in rare cases can you actually change the results around and boost the revenue.