No, these arguments that there is nothing wrong with buying a little lotto ticket once a year miss the big picture point!
If you play, you agree to potentially take the money of others who can ill afford to play (and some are addicted). We are NOT to tempt the weak or take from them. You win lotto money and you are taking from the weak (ie./ you are a stumbling block to them).
In context,
Romans 14:20-22
English Standard Version
20 Do not, for the sake of food, destroy the work of God. Everything is indeed clean, but it is wrong for anyone to make another stumble by what he eats. 21 It is good not to eat meat or drink wine or do anything that causes your brother to stumble. 22 The faith that you have, keep between yourself and God. Blessed is the one who has no reason to pass judgment on himself for what he approves.
In context, this is talking about the dietary practices of the Jews or the drunkenness of wine. Whereas Paul is now saying the objects themselves are now clean but we should watch ourselves in not causing sinful disputes over objects God has not made sinful in themselves.
If you use this passage alone you must in context say that the act of lotto in itself is clean and one should privately partake if one so desires as to not be a stumbling block to the weak.
If contributing is a stumbling block in itself then contributing to anything that is abused should be avoided. For example, the internet.
But one could debate if this passage could even be prescribed to the lotto in the first place or just the dietary/moral laws.
The only passage that comes to mind about gambling is in Acts 1 with the casting lots to choose the 12th apostle, which was a type of gamble.