forget about treaty or whatever u call it, every country has there own corruptible manners.
CV immigration has nothing to do with your 200 or more USD its the people that told you about it that has a hand in it, not the immigration. CV immigration wouldn't allow you to enter territory if you dont have enough cash at hand and also a place to stay. You must know someone to represent you, or make sure you have the required basic travel allowance. CV immigration requires that you have at hand at the point of entry, 1500 euros BTA and also To and Flo(go and come) air plane ticket including a hotel reservation...
Important notice, do never tell the immigration officer that you are entering CV for migration, or relocation, never you disclose that you are coming to stay forever, always say that you are there for 2 weeks holiday, when u are allowed in, then you can stay forever... you are not allowed to stay in the country for a long period of time, you are not supposed to pay any 200 or more USD to any one if you have enough cash at hand, only the people without basic funds pay the 200 or more clearance fee. be wise.
your investment money of 200,000 CV escudos is merely 2000usd, it should start up a little business or little office for you, depending on what u wanna do. when you arrive CV, there is a community of Ghanaian's which you should visit and get advice and so on.
Thanks