Would access to vigfree line guarantee results?

[asdfasdf1]

In a world where you have access to vigfree lines would it be easy to make say 2-3% ROI on wagers? For example watch price movements of MLB lines from open. Say in the first 8 hours it goes like this:

Open -110
1am -115
2am -120
3am -123
4am -125
5am -126
6am -126
7am -126

This looks like sharp money pounding an opening line to the current "true line" and then stopping because -126 no longer provides value in their mind. However, the vigfree line may be -122 and still worth betting, correct? Or do line movements & book line adjustments not really work like this?

Not related to this post topic, but one more newbie question: a line of -109/-101 suggests vigfree odds of roughly -105/+103 correct?

[asdfasdf1]

lol ok 2nd part of my post makes no sense... does -109/-101 translate to roughly -104/+104? Still curious about 1st paragraph in my post obviously.