Why does it say "Yitneni Malon"?
Radak: My dwelling should be in an inn...
Malbim: I myself should be an inn, and I could supply my needs by myself, and not need another person.
Why does he want to be in the Midbar and abandon his nation?
Radak: He cannot bear to see their evil.
Malbim (8:23): Amidst hatred for their bad deeds, he wants to distance himself from them.
Malbim: He wants to be isolated in the Midbar.
What is "Atzeres Bogedim"?
Rashi: It is gatherings of traitors.
Radak, Targum Yonasan: They gather to speak treachery and Sheker.
Radak citing his father: It is a kingdom of traitors. Atzeres is like "Yoresh Etzer" (Shoftim 18:7), "Zeh Yatzor b'Ami" (Shmuel I, 9:17).
Malbim: They gather in front of Hashem to serve and pray, but it is treachery, for their heart is full of sin - "Lo Uchal Aven va'Atzarah" (Yeshayah 1:13).
Malbim (2): This is like "ba'Shem Bagadu Vanim Zarim 1 " (Hoshe'a 5:7).
Malbim (2): There are two reasons why people have children. (a) To perpetuate the species - also animals do so. (b) Man's Nefesh speaks; his children are his heirs for this. The nation had Banim Zarim because they transgressed two Brisim regarding these - Bris Basar ("Kulam Mena'afim") and Bris ha'Lashon ("va'Yadrechu Es Leshonam" - verse 2).