Treasure in Heaven--a question of quantity

"One thing you lack: Go your way, sell whatever you have and give to the poor, and you will have  treasure  in heaven;" Mark 10.21

Is it okay to be motivated by greater reward in heaven to go beyond what might seem reasonable?

I wonder about the quantity of it.  If you have two godly people, both serving God, but one chooses to have less material things and give more for spiritual things, wouldn't he have more treasure in heaven than the other?

I've heard it said that the issue is the motivation behind one's giving and labor that will make a difference.  Obviously, a person with more resources could give more than one with less.  Of course a person with less resources may devote his life in service to God, while the person with more does not devote his life to God in the same way.  But if reward is based on what one has--which the story about the poor widow and her mites reveals--then a poor person may be giving more than a wealthy person.  

I do think it's possible for a person to choose to go beyond what might be expected of him.  Is a person properly motivated if he chooses to give more, time and resources, for the work of God, than a person who has equal time and resources but gives less, though properly motivated? 

It's hard to draw a line between treasure in heaven and getting the wants of this life.  People will get themselves into a financial bind with the house and cars they buy, and then be limited in giving money, or time--because they have to work more to pay for the things they want and got.  They may be properly motivated in the time and resources they do have and give for the work of God, but if they would have been more limiting in getting the things they want, and were able to devote more time and resources for the work of God, wouldn't their treasure/ reward be greater?

Wycliffe always need money.  Should I buy that vehicle I always wanted or give more to Wycliffe Translators and buy a cheaper car?   Would my reward be greater?  If a believer who is a multimillionaire gave a few million to Wycliffe, instead of a few hundred thousand so that they could accomplish all the translations they project to do, wouldn't the reward be greater for the multimillionaire?

I think this is a difficult issue.  But I do think there must be a greater reward for the one who chooses to give more than he could, even if it is motivated by a greater reward.  It's the right kind of reward to seek, and so I would think God would be pleased if the motivation is heavenly rewards. One could devote more time and resources towards the acquisition of temporal things--unless that has as its aim to advance the work of God.  No one knows where he's at or what he's achieved, it can only be an expectation.  God only knows.

"41  Now Jesus sat opposite the treasury and saw how the people put money into the treasury. And many [who] [were] rich put in much.  42  Then one  poor   widow  came and threw in two mites, which make a quadrans.  43  So He called His disciples to [Himself] and said to them, "Assuredly, I say to you that this  poor   widow  has put in more than all those who have given to the treasury;  44  "for they all put in out of their abundance, but she out of her poverty put in all that she had, her whole livelihood."  Mark 12