Wager for WLT ER: Sold shrs, bought calls

Sold 2k Wlt and bought 50 calls. Why? By swapping shrs with calls, the loss is capped at $850 should there is a selloff after ER, and the potential gains are anlarged if the market likes the ER. The only case for me to loss is that WLT will sit unchanged this week and MM will come back to move the stock next week after swallow my premiums. We will see.
 

07/30/14	1:50 PM EDT		Sell 1000 WLT Executed @ $5.9423	Details  |  Edit
	07/30/14	1:49 PM EDT		Buy 10 WLT Aug 01 '14 $6 Call Executed @ $0.16	Details  |  Edit
	07/30/14	1:49 PM EDT		Buy 17 WLT Aug 01 '14 $6 Call Executed @ $0.17	Details  |  Edit
	07/30/14	1:49 PM EDT		Buy 6 WLT Aug 01 '14 $6 Call Executed @ $0.17	Details  |  Edit
	07/30/14	1:49 PM EDT		Buy 17 WLT Aug 01 '14 $6 Call Executed @ $0.17	Details  |  Edit
	07/30/14	1:49 PM EDT		Buy 50 WLT Aug 01 '14 $6 Call Cancelled	Details  |  Edit
	07/30/14	1:49 PM EDT		Sell 1000 WLT Cancelled	Details  |  Edit
	07/30/14	1:49 PM EDT		Sell 1000 WLT Executed @ $5.9423	Details  |  Edit