1)
Why did Yisro decline to accept Moshe's offer to accompany Yisrael to Eretz Yisrael?
1.
Rashi: On account of both his property and his family.
1
2.
Ramban: Because he wanted to return to his hometown, where he owned real estate and where he was an honored member of society.
2
3.
Seforno: He was afraid that the change of climate and diet in his old age would harm him.
1
See Sifsei Chachamim and Oznayim la'Torah.
2
Ramban: Which explains why a share in the spoil did not tempt him to remain with Yisrael.