no ,lol ,you should accumulate as many as you can ..............
wtf is wrong with people thesedays ?

Then please tell me, why do you ask if it's so obvious?

i know they are separate blockchains, but don't they use same address format for pub/priv key?

you can buy/sell BTX at https://www.novaexchange.com/market/BTC_BTX/

1000.
{
  "amount": 37.42524564,
  "addr": "1DyxxGc9tHpvxXks3K7mM7qJcZgvy7VmPP",
  "wallet": 11657
}

Yes they do. However, sending BTC to your BTX address will not result in you getting BTX, nor vice versa. Even if you import the private keys of BTC wallet into BTX and vise versa. All that will happen is that you will spend fees moving coins to yourself. BTC coins and BTX coins have separate Coinbase hashes and separate transaction hashes associated with them.

Edit:Maybe I am misunderstanding what you want to accomplish. If you want to know if you can use the same keys for a paper wallet/cold storage. Yes you can, I believe. You may want to test a very trivial amount of BTX to verify. Just know that if you do that, if your cold storage device(s) becomes compromised, you risk both BTC and BTX. Also, your anonymity is somewhat less because if someone knows your public key for one, they know your public key for the other.

it's not about some 50 BTX at 2 bucks to reach to the top1000. you that right?
  

Bittrex already asked...

you has nothing to do than holding more than the last 1000th wallet! so no claiming needed...

greetz
steve