If you're winning you're probably beating the closing line. By itself beating the closing line means nothing.
Most importantly you need to understand that value betting means beating a zero juice line. There is no value in getting -105 on a game where the line is -110 either side. The zero juice line in that example is +100. Long term the only way to win is to beat the zero juice line. Even if your analysis is correct you'll still need some luck.
Experience told me the NFL Conference Championship lines opened away from where they should be. The zero juice line on the Ravens was off by at least 4%, (which is a lot), and the 49ers line was off by about 1.75%. By kickoff the handicaps had moved from borderline -3/-3.5 to -4.5 on the Ravens and from -6.5 to -7.5 on the 49ers. I was right, but it didn't do me any good.
Beating the closing line matters if the closing line is efficient, you're beating the zero juice closing line, you're betting volume, and you can withstand a streak of extreme misfortune. Good luck.