What you say seems self evident, but then this isn't the only case where Jesus points out that one must sell everything in order to enter into the kingdom. The tax collector jumps up from his pile of money and follows Christ without a thought. In Luke's gospel, it is only those who are followers who can sell everything and give the proceeds to the poor. It simply isn't possible for anyone else to be a follower.
The supreme irony is in noting that the rich young ruler comprehends his predicament. He sees that he can't part with his precious possessions, and this bothers him. The modern day Christian doesn't seem to be bothered by the ramifications of this decision in the slightest. A bit cavalier, to say the least.
If we look at the parables that follow, getting rid of one's possessions isn't a means of following Christ, but a consequence of discovering the kingdom. The tax collector recognizes the king. He sees the personification of Life itself standing in front of him, and he doesn't need to think about it. The rich young ruler recognizes something in Christ's words that tear at his heart, but not enough to separate him from his possessions. The modern day Christian naturally assumes they have been given the kingdom because the kingdom is merely a means of having "all these things" added to them. Who really needs to think about where their next meal is coming from when they have a credit card or a bank account? There is no reason for Jesus to suggest refraining from wondering where your next meal is coming from when you've got some folding money in your pockets. It's pure gibberish.
"for a man's life consisteth not in the abundance of the things which he possesseth...
Take no thought for your life, what ye shall eat; neither for the body, what ye shall put on.
33 Sell that ye have, and give alms; provide yourselves bags which wax not old, a treasure in the heavens that faileth not, where no thief approacheth, neither moth corrupteth....And they all with one consent began to make excuse...whosoever he be of you that forsaketh not all that he hath, he CANNOT be my disciple." - Luke 12:15,18,33