Think about what you're asking. You want to upgrade from a c2d to a sandy bridge CPU. Not only are they different sockets, you probably need new RAM. Sorry if you can't afford a new computer, too bad. As you say, we are in a first world country, you should be able to make enough money to purchase a new laptop.
Having recently come from PC myself, let me add my 2 cents.
C2D is what now, at least 3 generations old. So let's say you could upgrade your MBP C2D to something that is also in the C2D line. Chances are it wouldn't be much better anyways.
You can't go from C2D to the current sockets anyways. The only people that might allow for that leeway is AMD, with their AM2/3+ sockets. Even with that you'd need new RAM, not to mention you also have to weigh whether or not the power consumption would be well suited if you decided to upgrade....thereby making compromises.
While your brothers' laptops may have upgradeable laptops that extend beyond RAM and HDD...honestly, not that many people decide to upgrade their processors in their laptops.
They are too disposable in this day and age, especially if they are of the $500 variety. That's just a reality of living in the first world (really, developed country is the more appropriate term), you can't really have it both ways.
Really, in this case calling Apple stupid for not making more upgradable MBPs because they want to make money(!), then turning around and saying you live in the first world (really, developed country) and shouldn't have to buy a new computer every 2 years...is just...I don't even.
Clearly you are not satisfied with your MBP because it no longer suits your needs, so maybe you should opt for the more upgradable $500 laptops, you'll miss it less when you shove it off your desk.
Then again, since you have shoved it off your desk and it lies in pieces, you could always buy a new one, shove that one off it's desk and put it's innards into your 2010....
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