would you agree to teach in the classroom if you knew other teachers would be teaching from home and making the same or more $$ than you?

I would much rather teach in person than online.  Students learn much better by not only interacting with the teacher but with their fellow classmates as well.  Sometimes a student needs the teacher to sit beside him/her to further explain the concept which doesn't happen over the internet. In addition with in-classroom teaching the teacher can readily gauge by the students' faces, questions, answers how well the lesson is going and if necessary restart the lesson using a different approach.  

It has been my experience that if a student is having difficulties in framing a question or understanding the concept another classmate can readily understand the student and often provides a better explanation than the teacher. 

Teaching is much more than presenting academics.  Classroom instruction also provides opportunities for students to develop the interpersonal skills they will need when they enter the "real" world. 

Some of my neighbours are teachers all and all of them say that students do better with in-class learning than they do online. 

If you think you are being a guinea pig then one of your options is to quit.  Another option is to get vaccinated.  Do keep in mind that if everyone follows the rules the pandemic will end sooner rather than later.   

You are not the only teacher in a classroom with students. So, not a guinea pig.

If you feel this is a danger to you, then quit. Try a another school district 

Most teachers would tell you that they are finding the teaching from home much harder- it's harder to keep the students engaged, more work to set up activities, and harder to interact with students. I was virtual in the fall and back in the classroom this spring. I MUCH prefer teaching in the classroom. It's so much easier! You set up group activities and then just walk around monitoring. I don't know what you mean by "guinea pig". Get vaccinated. I am, and I'm not worried about being in the classroom with my students. We're all in masks, which is a little bit difficult, but no terribly. Do you plan to stay a part-timer forever? Or would you like a full-time job? You have a much better chance of getting a job offer if you go into your teaching with a better attitude. 

so quit then.  part timers are always lowest on the totem pole.