This isn't new, not at all. Thousands of years ago, G-d made such a deal with the Jewish People. Read about it in this week's Parshat Shavua, Torah Portion of the Week, Ekeiv:
יג וְהָיָה, אִם-שָׁמֹעַ תִּשְׁמְעוּ אֶל-מִצְוֹתַי, אֲשֶׁר אָנֹכִי מְצַוֶּה אֶתְכֶם, הַיּוֹם--לְאַהֲבָה אֶת-יְהוָה אֱלֹהֵיכֶם, וּלְעָבְדוֹ, בְּכָל-לְבַבְכֶם, וּבְכָל-נַפְשְׁכֶם. 13 And it shall come to pass, if ye shall hearken diligently unto My commandments which I command you this day, to love the LORD your God, and to serve Him with all your heart and with all your soul,
יד וְנָתַתִּי מְטַר-אַרְצְכֶם בְּעִתּוֹ, יוֹרֶה וּמַלְקוֹשׁ; וְאָסַפְתָּ דְגָנֶךָ, וְתִירֹשְׁךָ וְיִצְהָרֶךָ. 14 that I will give the rain of your land in its season, the former rain and the latter rain, that thou mayest gather in thy corn, and thy wine, and thine oil.
טו וְנָתַתִּי עֵשֶׂב בְּשָׂדְךָ, לִבְהֶמְתֶּךָ; וְאָכַלְתָּ, וְשָׂבָעְתָּ. 15 And I will give grass in thy fields for thy cattle, and thou shalt eat and be satisfied.
There's one big difference between G-d's conditions and the examples I gave earlier:
טז הִשָּׁמְרוּ לָכֶם, פֶּן יִפְתֶּה לְבַבְכֶם; וְסַרְתֶּם, וַעֲבַדְתֶּם אֱלֹהִים אֲחֵרִים, וְהִשְׁתַּחֲוִיתֶם, לָהֶם. 16 Take heed to yourselves, lest your heart be deceived, and ye turn aside, and serve other gods, and worship them;
יז וְחָרָה אַף-יְהוָה בָּכֶם, וְעָצַר אֶת-הַשָּׁמַיִם וְלֹא-יִהְיֶה מָטָר, וְהָאֲדָמָה, לֹא תִתֵּן אֶת-יְבוּלָהּ; וַאֲבַדְתֶּם מְהֵרָה, מֵעַל הָאָרֶץ הַטֹּבָה, אֲשֶׁר יְהוָה, נֹתֵן לָכֶם. 17 and the anger of the LORD be kindled against you, and He shut up the heaven, so that there shall be no rain, and the ground shall not yield her fruit; and ye perish quickly from off the good land which the LORD giveth you.
Yes, if we don't keep our side of the contract, it's not just a simple situation where we get nothing. We lose what we have. This has happened. The Jewish People has been exiled from Eretz Yisrael, the Land of Israel in the past. We had better shape up, or it can G-d forbid happen again.